Mr. Chang's class has 28 students, 4/8 of whom are girls. Which equation shows how to determine the numbers of girls in Mr. chang's class? 28÷4/7=49

28÷4/7=16

4/7÷28=1/49

7/4÷28=1/16

b

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.19875994384

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1699/ 8548

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b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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